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Show that for a projectile the angle bet...

Show that for a projectile the angle between the velocity and the X-axis as a function of the time Is given by
`theta(t) = tan^-1((v_(0y)-gt)/v_(alphax))`

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`tan aplha = v_y/v_x = (v_(y0)-gt)/(v_xO)` or `alpha = tan^-1[(v_(y0)-gt)/v_(x0)]`
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